TURIN, Italy (AP) — Andrey Rublev rallied to upset second-seeded Stefanos Tsitsipas and reach the final four of the ATP Finals on Friday.
Rublev won 3-6, 6-3, 6-2 to reach the semifinals for the first time. He will face third-seeded Casper Ruud.
Novak Djokovic plays Taylor Fritz of the United States in the other semifinal. The five-time champion will have to recover swiftly after a grueling dead rubber victory over Daniil Medvedev that lasted more than three hours.
"On the physical side, I'm not worried because . . . worry just depletes you of the vital energy you need," Djokovic said. "If something happens tomorrow in a good or bad way, it happens, and I have to deal with it then.
"I'm going to do everything I possibly can today with my physio, with myself, with my team in order to get the good rest, the good recovery . . . I've had many cases in my life before where I managed to recover very quickly. Hopefully that's going to be the case again."